Comparative Pharmacology
Head-to-head clinical analysis: ORTHO NOVUM 1 80 21 versus ORTHO NOVUM 10 11 28.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ORTHO NOVUM 1 80 21 versus ORTHO NOVUM 10 11 28.
ORTHO-NOVUM 1/80 21 vs ORTHO-NOVUM 10/11-28
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Combination estrogen-progestin contraceptive. Suppresses gonadotropin (FSH, LH) release from pituitary, inhibiting ovulation. Increases viscosity of cervical mucus, impeding sperm penetration. Induces endometrial thinning, reducing implantation likelihood.
Combination estrogen-progestin contraceptive; suppresses gonadotropins (FSH, LH) via negative feedback inhibition of hypothalamic-pituitary axis, preventing ovulation; increases cervical mucus viscosity, impeding sperm penetration; alters endometrial development, reducing implantation likelihood.
One tablet orally once daily for 21 consecutive days, followed by 7 days off therapy.
One tablet daily for 28 days, starting on day 1 of menstrual cycle. Each tablet contains 1 mg norethindrone and 10 mcg ethinyl estradiol for first 10 tablets, then 1 mg norethindrone and 35 mcg ethinyl estradiol for next 11 tablets, followed by 7 placebo tablets.
None Documented
None Documented
Norethindrone terminal half-life: 8-11 hours; Mestranol (ethinyl estradiol pro-drug) terminal half-life: 10-15 hours (metabolite ethinyl estradiol). Clinical context: Steady-state reached in 5-7 days; once-daily dosing maintains therapeutic levels.
Norethindrone: 5-14 hours; Ethinyl estradiol: 8-20 hours. Steady state reached within 5 days. Clinical significance: missed doses may increase pregnancy risk due to rapid decline.
Renal: ~60% (metabolites, primarily glucuronide and sulfate conjugates), Fecal: ~40% (biliary excretion of metabolites). Unchanged drug negligible.
Renal (50-60% as metabolites, <10% unchanged); fecal (30-40%) with biliary elimination of conjugates.
Category C
Category C
Hormonal Contraceptive
Hormonal Contraceptive